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Temperature-insensitive multipoint strain-sensing system based on fiber Bragg gratings and optical power detection scheme

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4 Author(s)
Y. J. Chiang ; Inst. of Photonics Technol., Nat. Tsing Hua Univ., Hsinchu, Taiwan ; Likarn Wang ; Wen-Fung Liu ; C. S. Hsiao

This work presents a new temperature-insensitive multipoint strain sensor based on fiber Bragg gratings. A divider circuit at the post detection port compensates for optical power variation and thermal instability induced by the nonflatness of the source spectrum. Experimental results show a measurement resolution of ±0.35 μS and a temperature stability of ±0.005% for no strain (±0.48% for a strain of <400 μS) in an example with two sensing points. A measurement linearity of ±0.17% is estimated in the range 0 to 350 μS with no crosstalk.

Published in:

IEEE Sensors Journal  (Volume:6 ,  Issue: 2 )